| With the rapid development of information technology,people’s demand for performance of information processing is also increasing.Optical technology has attracted more and more people’s attention due to its advantages of ultra-high speed,large bandwidth and low loss.Attempts have been made to use optical methods to improve the performance of information processing and some successfully design a variety of optical simulation computing devices.Conventional optical methods need the macro-sized lenses,so the system is large in size and difficult to integrate.In recent years,although the device designed by micro-nano optical technology has reduced the size to the wavelength level,the design of the device is too complicated to realize.Currently,only theoretical results are reported.In this paper,we chose the spatial differentiator as the research direction and expect to design a spatial differentiator with smaller size,simple structure and easy to realize.Firstly,based on the two different physical mechanisms of surface plasmon polaritons and optical spin Hall effect,the principle and feasibility of the two mechanisms for realize differentiator are discussed and briefly deduced.Then,according to the theoretical results,the experimental scheme is designed and the optical path is built,and an optical system for measuring multiple performance parameters of two differentiators is completed.Finally,the sample devices are prepared,and by controlling different signals and conditions of input light,we finish various measurements of the two devices such as reflectance curve,first-order differential operation processing,image edge extraction application.The performance of two devices are verified by transfer functions,effective bandwidth,limit resolution and it is verified with the theoretical simulation results.The feasibility of the two differentiators is experimentally confirmed. |
